[PHP知识库]java实现读写锁

package concurrent.rwl;

import java.util.Random;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * @author wengyinbing
 * @data 2021/9/21 18:22
 **/
public class MyWriteAndReadTest {
    private static Random random = new Random();
    private static int threadCount = 50;
    //private static ReadWriteLock lock = new ReadWriteLock();
    private static ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
    static String data = "";

    private static class Write implements  Runnable{
        //写锁 排它锁
        @Override
        public void run() {
            Lock wl = lock.writeLock();
            wl.lock();
            try {
                long time = random.nextInt(20) * 100L;
                System.out.println(Thread.currentThread().getName() +" 开始写 : " + time);
                Thread.sleep(time);
                data = randomPool(10);
                System.out.println(Thread.currentThread().getName() +" 结束写 : " + time);
                System.out.println("写 = " + data);
                System.out.println();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
           finally {
                wl.unlock();
            }
        }
    }

    private static class Read implements  Runnable{
        //读锁 共享锁
        @Override
        public void run() {
            Lock rl = lock.readLock();
            rl.lock();
            try {
                long time = random.nextInt(20) * 100L;
                System.out.println(Thread.currentThread().getName() +" 开始读 : " + time);
                Thread.sleep(time);
                //data = randomPool(10);
                System.out.println(Thread.currentThread().getName() +" 结束读 : " + time);
                System.out.println("读 = " + data);
                System.out.println();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            finally {
                rl.unlock();
            }
        }
    }

    private static String randomPool(int size){
        StringBuilder sb = new StringBuilder();
        for(int i=0;i<size;i++){
            sb.append((char)(random.nextInt(25)+'a'));
        }
        return sb.toString();
    }
    public static void main(String[] args) {
        ThreadPoolExecutor threadPoolExecutor =
                new ThreadPoolExecutor(8,16,1l, TimeUnit.MILLISECONDS,new LinkedBlockingQueue<>());
        for(int i=0;i<20;i++){
            if(random.nextInt()%2==0) {
                threadPoolExecutor.execute(new MyWriteAndReadTest.Write());
            }
            else{
                threadPoolExecutor.execute(new MyWriteAndReadTest.Read());
            }
        }
        threadPoolExecutor.shutdown();
    }
}

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